Not really into the whole 4K thing quite yet, would rather have higher frames then 4K. Remember most games are lucky to hit 60FPS at 4K now a days with a single 1080ti. Also with SLI support diminishing quite a bit, can't count on SLI to boost you up past that.

Maybe this next gen of video cards will be capable, but I don't think they are right now of even getting close to 144FPS at 4K unless graphics are way down.